use ecmaVersion 17

packages/svelte/package.json

@@ -170,7 +170,7 @@
     "@jridgewell/sourcemap-codec": "^1.5.0",
     "@sveltejs/acorn-typescript": "^1.0.5",
     "@types/estree": "^1.0.5",
-    "acorn": "^8.12.1",
+    "acorn": "^8.15.0",
     "aria-query": "^5.3.1",
     "axobject-query": "^4.1.0",
     "clsx": "^2.1.1",

packages/svelte/src/compiler/phases/1-parse/acorn.js

@@ -50,7 +50,7 @@ export function parse(source, comments, typescript, is_script) {
 		ast = parser.parse(source, {
 			onComment,
 			sourceType: 'module',
-			ecmaVersion: 16,
+			ecmaVersion: 17,
 			locations: true
 		});
 	} finally {
@@ -84,7 +84,7 @@ export function parse_expression_at(source, comments, typescript, index) {
 	const ast = parser.parseExpressionAt(source, index, {
 		onComment,
 		sourceType: 'module',
-		ecmaVersion: 16,
+		ecmaVersion: 17,
 		locations: true
 	});
 

packages/svelte/tests/runtime-runes/samples/using/_config.js

@@ -0,0 +1,11 @@
+import { flushSync } from 'svelte';
+import { test } from '../../test';
+
+export default test({
+	html: '',
+
+	test({ assert, target }) {
+		flushSync();
+		assert.htmlEqual(target.innerHTML, `<p>connected: true</p><p>disposed: true</p>`);
+	}
+});

packages/svelte/tests/runtime-runes/samples/using/main.svelte

@@ -0,0 +1,18 @@
+<script>
+	let connected = $state(false);
+	let disposed = $state(false);
+
+	const getConn = () => {
+		connected = true;
+		return {
+			[Symbol.dispose]() {
+				disposed = true;
+			}
+		}
+	}
+
+	using conn = getConn();
+</script>
+
+<p>connected: {connected}</p>
+<p>disposed: {disposed}</p>

pnpm-lock.yaml

@@ -75,7 +75,7 @@ importers:
         specifier: ^1.0.5
         version: 1.0.8
       acorn:
-        specifier: ^8.12.1
+        specifier: ^8.15.0
         version: 8.15.0
       aria-query:
         specifier: ^5.3.1